why no programs on tv about the history of cinema?

over 450,000 films made so far? Yet the great escape is shown fortnightly.

I have a list somewhere of supposedly the top one thousand films ever made. Meant to search them out, but my lazybones won't let me. It would be nice to see more programs like the RKO story on the box. Someone should do a comprehensive history of cinema - not just the Hollywood stuff but a world view.

the BBC years ago had a japan season. They even had Alex Cox do elaborate art house seasons.

Would like to see rare films on tv. Seems to be very mainstream.